<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
  <style>
    #gy{color: green}
    .y{
      color:yellow;}
    input[type="text"],body>p{background-color: red}
    body>div>div>p{color: red}
    body>div>div>p{background-color: yellow}

    a:link{color: green}
    a:visited{
      color: red;}
    a:hover{color: yellow}
    a:active{color: pink}


  </style>




</head>
<body>
<ul>
  <li>刘备</li>
  <li id="gy">关羽</li>
  <li class="y">张飞</li>
</ul>
<p>香蕉</p>
<p class="y">苹果</p>

<input type="text" placeholder="用户名">
<input type="password" placeholder="密码">

<div>
  <p>p1</p>
  <div><p>p2</p></div>
  <div><div><p>p3</p></div></div>
</div>
<a href="http://www.baidu.com">达内官网</a>

</body>
</html>